need help on an electronic attendance marker

hi myname is vasant and iwant to construct an electronic attendance marker which can take the attendance of studentsby some kind of identification process using a computer.i want suggestions and i want to know way to make this project a better one :roll:

The "speed pass" system used at some highway toll gates would be applicable. Check it out.

need more fool proof technique

thank you fro your idea on using proximity cards but any person who has access to that card can give atendance to his friend .i want to use either voice recognition or finger printing technology. i want a good circuit diagram aslo for it , if possible.please replt to sniper43228@rediffmail.com :lol: :lol: